Posted on May 17, 2011 at 09:52Ciao
I have read many message to bank switching and
the most correct way to switch is:
Code:
/* prepare bank0 for user operation */
FMI->BBSR = 0;
FMI->NBBSR = 6;
FMI->BBADR = 0x20000; //0x80000 >> 2
FMI->NBBADR = 0x0;
FMI->CR |= 0x18; /* Enable banks 0 & 1 */
Jump_To_Application = (pFunction) BANK0_START_ADDR;
Jump_To_Application();
}
well this code is correct for switch and now
I can look the loader code at address 0x00000000
and the program code at address 0x00080000
but...
when i try to access at address
0x00080000 ok
0x00086000 ok
0x00087000 ok
0x00087ffc ok
0x00088000 oh oh i cannot read this why ?
this bank is 512kb large :(
mumble... mumble....
maybe is better if check the loader in bank 1
0x00000000 ok
0x00006000 ok
0x00007000 ok
0x00007ffc ok
0x00008000 ok OK ??? oh oh... why i can read this ?
0x00008000 is redoundacy of 0x00000000
0x00010000 is redoundacy of 0x00000000
0x00018000 is redoundacy of 0x00000000
0x00020000 is redoundacy of 0x00000000
this bank is 32kb large :(
mumble... mumble....
I try to set
Code:
FMI->BBSR = 4; <<<<<<<<<<<<<< Changed
FMI->NBBSR = 2; <<<<<<<<<<<<<< Changed
FMI->BBADR = 0x20000; //0x80000 >> 2
FMI->NBBADR = 0x0;
FMI->CR |= 0x18; /* Enable banks 0 & 1 */
checking....checking....
Wooow
Now work fine, very fine
the loader writed in 0x00080000 is
visible at address 0x00000000 and memory is
accessible thru 0x00007ff0
the program code writed in 0x00000000 is
visible at address 0x00080000 and is
accessible thru 0x000ffff0
Why in all document in this forum and in all example
all says this ?
FMI->BBSR = 0;
FMI->NBBSR = 6;
when work fine this ?
FMI->BBSR = 4; <<<<<<<<<<<<<< Changed
FMI->NBBSR = 2; <<<<<<<<<<<<<< Changed
ciao a tutti
Beppe
p.s. sorry for my english
🙂
